lignite vs wood coal

lignite and wood coal both are nouns.

Word	Noun	Adjective	Verb	Adverb
lignite	Yes	No	No	No
wood coal	Yes	No	No	No

As nouns, lignite and wood coal are synonyms defined as:

Other synonyms of lignite include brown coal.

lignite (noun)	wood coal (noun)
intermediate between peat and bituminous coal	intermediate between peat and bituminous coal
	a carbonaceous material obtained by heating wood or other organic matter in the absence of air